@article{CMH_1993__68_2_140306,
     author = {Michael N. Dyer},
     title = {Groups with no infinite perfect subgroups and aspherical 2-complexes.},
     journal = {Commentarii mathematici Helvetici},
     pages = {333--340},
     publisher = {mathdoc},
     volume = {68},
     number = {2},
     year = {1993},
     zbl = {0791.57003},
     url = {http://geodesic.mathdoc.fr/item/CMH_1993__68_2_140306/}
}